SYMPOSIA PAPER Published: 01 January 1990

Influence of Load Levels on Damage Growth Mechanisms of Notched Composite Materials


The effect of cyclic load amplitudes is studied using X-ray radiography and ply level electron microscopic analysis. The influence of fatigue-induced damage on the final fracture of the laminate is presented. From the findings, it is clear that delamination and fiber fracture have well-defined roles in the final fracture of both center-notched quasi-isotropic [0/45/90/-45]s4 and orthotropic [0/45/0/-45]s4 laminates under high- and low-amplitude fully reversed cyclic loading (R = -1). Depending on the material system (eight-harness satin weave Celion 3000/PMR-15, quasi-isotropic T300/5208, and quasi-isotropic and orthotropic AS4/1808), and the load level used, interaction modes between delamination, fiber fracture, localization, and the extent of fiber fracture distribution throughout the damaged zone were found to vary. The load level was also found to influence the interaction between the adjacent fibers in the satin weave Celion 3000/PMR-15 unidirectional system.

Author Information

Razvan, A
Pennsylvania State University, University Park, PA
Bakis, CE
Pennsylvania State University, University Park, PA
Reifsnider, KL
Pennsylvania State University, University Park, PA
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Developed by Committee: D30
Pages: 371–389
DOI: 10.1520/STP24121S
ISBN-EB: 978-0-8031-5120-8
ISBN-13: 978-0-8031-1287-2